GB1262335A - Digital focal length modulator - Google Patents
Digital focal length modulatorInfo
- Publication number
- GB1262335A GB1262335A GB07581/69A GB1758169A GB1262335A GB 1262335 A GB1262335 A GB 1262335A GB 07581/69 A GB07581/69 A GB 07581/69A GB 1758169 A GB1758169 A GB 1758169A GB 1262335 A GB1262335 A GB 1262335A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lenses
- focal length
- biconcave
- foci
- april
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/31—Digital deflection, i.e. optical switching
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Optical Head (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
1,262,335. Light modulation. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 3 April, 1969 [6 April, 1968], No. 17581/69. Heading H4F. [Also in Division G2] A digital focal length modulator has a plurality of stages which are arranged in succession along the optical axis and which each comprise an electro-optical polarization switch and a birefringent lens, and is characterized that in one, or a plurality, or all, of the stages, there are provided at least two birefringent lenses arranged one behind the other with the optic axes of the material of the two lenses normal to one another and normal to the principal planes of the lenses, while the adjacent faces of the lenses are curved in the same sense, i.e. they may be complementary, but not necessarily. The focal lengths of the lenses decrease by a factor of two at each stage and if the end surfaces of each lens combination are planar, the locations of the foci are substantially independent of changes in the refractive index of the ambient medium due to temperature, and the foci are spread equally about a mean position, Fig. 2 (not shown). A biconcave-binconvex-biconcave three element lens combination is shown in Fig. 4 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681764133 DE1764133A1 (en) | 1968-04-06 | 1968-04-06 | Digital optical focal length modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1262335A true GB1262335A (en) | 1972-02-02 |
Family
ID=5697870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB07581/69A Expired GB1262335A (en) | 1968-04-06 | 1969-04-03 | Digital focal length modulator |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3565510A (en) |
| JP (1) | JPS4811056B1 (en) |
| DE (1) | DE1764133A1 (en) |
| FR (1) | FR2005719A1 (en) |
| GB (1) | GB1262335A (en) |
| NL (1) | NL6905091A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5062253A (en) * | 1973-10-04 | 1975-05-28 | ||
| US4981342A (en) * | 1987-09-24 | 1991-01-01 | Allergan Inc. | Multifocal birefringent lens system |
| US20060175130A1 (en) * | 2003-09-18 | 2006-08-10 | Riley D P | Hanging scaffold support bracket |
| WO2021044659A1 (en) * | 2019-09-04 | 2021-03-11 | 株式会社村田製作所 | Lens unit |
-
1968
- 1968-04-06 DE DE19681764133 patent/DE1764133A1/en active Pending
-
1969
- 1969-04-01 NL NL6905091A patent/NL6905091A/xx unknown
- 1969-04-03 GB GB07581/69A patent/GB1262335A/en not_active Expired
- 1969-04-07 JP JP44026247A patent/JPS4811056B1/ja active Pending
- 1969-04-07 US US813940A patent/US3565510A/en not_active Expired - Lifetime
- 1969-04-08 FR FR6910639A patent/FR2005719A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| US3565510A (en) | 1971-02-23 |
| DE1764133A1 (en) | 1971-05-13 |
| JPS4811056B1 (en) | 1973-04-10 |
| NL6905091A (en) | 1969-10-08 |
| FR2005719A1 (en) | 1969-12-12 |
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